User blog comment:GalaxiaWild/What did Vergil intend to do with Sparda's power in DMC3?/@comment-6769189-20140409061332

Thats a question even Vergil himself was unable to answer. Dante asked him and he just got aggrivated. The best answer is that he simply doesn't want to be weak, and the insecurity is so great that he is willing to damn the human race. As a side note it was never confirmed that had a son, nor would it make too much sense that he did.